Attachments for fluid pressure cylinder and piston



Feb. 23, 1965 w. E. sToNEBERG 3,170,672

ATTACHMENTS FOR FLUID PRESSURE CYLINDER AND FISTON Filed Sept. 24, 1962 ATTORNEYS United States Patent() 3,170,672 ATTACHMENTS FOR FLUID PRESSURE CYLINDER AND PISTON William E. Stoneberg, Maxwell, Iowa Filed Sept. 24, 1962, Ser. No. 225,688 3 Claims. (Cl. 254-93) It is another object of this invention to provide a superior hydraulic jack operable from the power lift of a tractor.

It is a further object of this invention toprovide 'for such a lifting jack of the type described a removable base and head therefor adapted to so position the fluid pressure cylinder that tilting of the jack assembly is prevented, thereby providing a lifting jack that can be safely utilized in doing a variety of odd tasks including lifting implements, jacking up buildings, removing stumps, and the like.

Other and further objects of this invention will become apparent to those skilled in the art Afrom a reading [of the present specification taken together with the drawings, in which:

FIG. l is a view in side elevation of an embodiment of the jack assembly of this invention;

FIG. 2 is a view in side elevation as seen from left to right of FIG. 1;

, FIG. 3 is a view in vertical section as seen from the line 3-3 of FIG. 2;

FIG. 4 is a view in vertical sectionas seen from the line 4-4 of FIG. 2.

Referring to the drawings, there is seen an embodiment of a fluid actuated jack `assembly of the invention, herein referred to generally by the numeral 10, which is composed of a fluid pressure cylinder 12 (including -a piston equipped plunger rod 14), a base 16 and a head 18.

Fluid pressure cylinder 12 i-s of the type conventionally used in connection with agricultural equipment. It is composed of a tubular portion 20 Within which piston equipped plunger rod 14 moves. The bottom of tubular portion 20 is closed by a cap 22 whose end face 21 is bifurcated. lSuch bifurcation is achieved by a pair of spaced, parallel, lengthwise-extending, depending tongues 24, sometimes referred to herein as lugs positioned generally equidistant from the axis of tubular portion 20 on end face 21. Aligned apertures 26 (pair) extend one through each tongue 24 in a direction generally normal to the laxis of tubular portion 20. The top of tubular portion 20 is yclosed by a 'cap 32 through which extends plunger rod 14. The upper or exposed end of 'pistoni equipped plunger rod 14 is formed to provide a bifurcated or generally U-shaped element 34, sometimes referred toV herein as a mounting element which has a base 36 and a pair of spaced, parallel, upstanding tongues 38, each so positioned las to be generally equidis-tant from the extended axis of plunger rod 14. Aligned apertures 40 (pair) extend one through each tongue 38 in a direction generally normal to the axis of plunger rod 14. Hydraulic fluid under pressure is introduced into the lower end of fluid pressure cylinder 12 through flexible conduit 28. As piston equipped plunger rod 14 rises, hydraulic uid in the upper portion of iluid pressure cylinder 12 is exhausted through exible conduit 30. Piston equipped plunger rod 14 is lowered conveniently by simply reversing this procedure, i.e., hydraulic uid under pressure is introduced through flexible conduit 30 while fluid in the lower end of cylinder 12 is exhausted through exible conduit 28.

The base 16 is composed of a plate 42, generally square in shape, -to the top face of which, along a hypothetical center-line, is fastened the bottom edge of a flange or leaf 44, sometimes referred to herein as a wall element. Flange 44 is braced in an upright position by means of two pairs of braces 46, each one of which is formed in the shape of an equilateral triangle. One member of a pair of braces 46 is positioned ona side of flange 44 so that one side thereof opposes a side of the other member of such pair on the 'opposite side of flange 44. Positioned in the top mid-region of the side of flange 44 along a hypothetical center-line is an aperture 48.

In the ytop edge of flange or leaf 44 is mounted a pair of adjustable stop screws 50. In the embodiment shown, each stop screw 50 comprises a bolt having a head portion 52 and a threaded shank portion 54. Each stop screw 50 screws into a threaded bore 56 in the top edge of flange or leaf 44. Bores 56 (paired) are approximately parallel to one another. The distance between bores 56 is not greater than the distance across the end face 21 of cap 22, and the distance of each bore 56 from aperture 48 is approximately equal.

Here, when the fluid pressure cylinder 12 is mounted on the base 16, opposed faces of tongues 24 slip over the top edge of leaf 44 and loosely engage each face of leaf 44. The cylinder 12 is positioned so that apertures 26 in tongues 24 align with aperture 48 in leaf 44. Then a cross pin 58 is slipped through the aligned apertures. Conveniently, cross pin 58 is equipped with a stop bar 60 which pierces lan end region iof pin 58. Stop screws 50 are then Iadjusted `so as to butt up against the end face 21 of bottom cap 22. Usually, uid pressure cylinder 12 is positioned by means of stop Vscrews 50 so that lthe axis of fluid pressure cylinder 12 is perpendicular to the base plate 42. The resulting assembly of fluid pressure cylinder 12` and base 16 is locked against tilting movement of the fluid pressure cylinder 12 relative to the base 16 about the axis tof cross pin S8.

The head 18 is composed of a plate 62, generally rectangular in shape, tothe bottom face of which, along a hypothetical center-line, is fastened the top edge of a flange or leaf 64. Flange 64 has an aperture 66 positioned in the bottom mid-region of its side along a hypothetical center-line.

In the bottom edge of flange or leaf 64 is mounted a pair of adjustable stop screws 68. In the embodiment shown, each stop screw 68 comprises a bolt having a head portion 70 and a threaded shank portion 72. Each stop screw 68 screws into a threaded bore 74 (pair) in the bottom edge of flange or leaf 64. The bores 74 are each positioned `so that the respective distance of each from aperture 66 is approximately equal and the distance between bores 74 along the bottom edge 76 of flange 64 is not greater than the width across the inside of base 36 of U-shaped element 34. The bores 74 are so positioned in flange 64 as to make the stop screws upwardly diverging.

` The angle each bore makes with respect to the hypothetialigned apertures. Conveniently, cross pin 78 is equipped with a stop bar 80 which pierces an end region of pin 78. Stop screws 68 are then adjusted yso as to butt up against the inside of base 36 of U-shaped element34. Usually, the head plate 62 is positioned by means of stop screws 68 so that the axis of fluid pressure cylinder 12 is perpendicular to the head plate 62. When desired, the stop screws may be adjusted to dispose the head at an oblique angle relative to the piston rod 14. The resulting assembly of uid pressure cylinder 12 and head 18 is locked against tilting movement of the fluid pressure cylinder 12 relative to the head 18 about the axis of cross pin '78.

Any conventional materials of construction can be used in manufacturing the head and base elements; although, it is preferred that metals be employed. Conveniently, the various components of the respective base 16 and head 18 can be welded together.

It will be appreciated that, while the above description has been made by reference to a particular type of uid cylinder, any fluid pressure cylinder of the type conventionally found anound a farm and which has bifurcated ends can be used for the lifting mechanism of this invention. As, similarly, while the foregoing description has been made in reference to a particular respective head and base construction, it will 'be appreciated that any conventional head or base structure can be used so long as it has lthe adjustable stop screws positioned therein to stabilize and prevent tilting of the uid pressure cylinder with respect to the head and base.

In summary, the lifting assembly of the present invention comprises a generally upstanding uid pressure cylinder including a piston equipped plunger rod, said cylinder having a bifurcated mounting element at its lower end, and said plunger rod having a bifurcated mounting element 'at its upper end; means for introducing fluid under pressure into the lower end of said cylinder; a base having a generally upstanding leaf adapted to be received in a bifurcated end of said cylinder, the upper edge of the said leaf having mounted therein a pair of adjustable stop means, each adapted to abut against such bifurcated cylinder end; and a head having a generally depending leaf adapted to be received in the other bifurcated end of said cylinder, the lower edge of said leaf having a pair of adjustable stop means mounted therein, each adapted to abut lagainst such bifurcated cylinder end, The opposite bifurcated mounting elements of the uid pressure cylinder and the piston rod, respectively, and the respective base and head members have aligned apertures extending therethrough in directions generally normal to the axis of the luid pressure cylinder for cross pins to slidably extend therethrough.

I claim:

1. A jack comprising (a) a generally upstanding uid pressure cylinder having a piston positioned therein for reciprocatory movements, said piston having a plunger rod projecting through the upper end of said cylinder,

(b) a pair of spaced, parallel, projecting tongues mounted on the bottom end of said cylinder,

(c) a rst pair of crosswise-extending aligned apertures,

one through the side of each such tongue,

(d) a U-shaped element whose base is centrally mounted on the exposed end of said plunger rod,

(e) a second pair of crosswise-extending aligned apertures, one through each side of said U-shaped members (f) a base having a bottom plate and an upstanding leaf, said upstanding leaf being adapted to extend between said pair of tongues and having an aperture *aligned with the aperture in each tongue,

(g) a head having a top plate and a depending leaf,

A said depending leaf being adapted to extend between the sides of said U-shaped element and having an aperture aligned with the aperture in each such side,

(h) a bottom pin and a top pin, each slidably extending through such respective aligned apertures,

(i) a pair of adjustable stop screws positioned in said upstanding leaf and adapted to so engage the bottom end of said cylinder as to prevent tilting movements of said cylinder on the axis of said bottom pin,

(j) a pair of adjustable stop screws positioned in said depending leaf and adapted to so engage said U- shaped member as to prevent tilting movements of said cylinder on the axis of said top pin, and

(k) means for introducing and removing fluid into and from, respectively, said cylinder so as to produce reciprocatory movements of said plunger rod.

2. A jack comprising:

(a) a uid pressure cylinder having a lower mounting element at its lower end and including a pair of laterally spaced generally parallel depending lugs, and a piston equipped plunger rod projecting upwardly from the upper end of said cylinder, said plunger rod having a mounting element at its upper end, including a pair of laterally spaced, generally parallel, upwardly extending lugs;

(b) a base, including a plate and an upstanding wall element, said wall element being received at its upper portion in said lower mounting element, a pair of laterally spaced adjustable stop screws mounted in the upper portion of said wall element abutting said lower mounting element intermediate said depending lugs, and

(c) ahead, having a depending flange received in said upper mounting element of said plunger rod, the lower edge of said flange having mounted therein a pair of laterally spaced adjustable stop screws abutting said mounting element of said plunger rod intermediate said upwardly extending lugs.

3. The jack of claim 2 wherein the upstanding wall element of said base and the lower mounting element of said cylinder have alignable apertures extending therethrough, the depending ange of said head and thevmounting element of said upwardly projecting plunger rod having alignable apertures extending therethrough; and in further combination with cross pins slidably extending through respective aligned apertures.

References Cited in the tile of this patent UNITED STATES PATENTS 789,071 Schroer May 2, 1905 1,342,057 Miller June 1, 1920 1,359,876 Davidson Nov. 23, 1920 1,709,506 Wallace et al Apr. 16, 1929 2,582,896 Acton Jan. 15, 1952 2,657,009 Neis et al Oct. 27, 1953 2,749,089 Feay et al June 5, 1956 2,838,278 Johnsen June 10, 1958 FOREIGN PATENTS 18,223 Great Britain Aug. 1l, 1911 

2. A JACK COMPRISING: (A) A FLUID PRESSURE CYLINDER HAVING A LOWER MOUNTING ELEMENT AT ITS LOWER END AND INCLUDING A PAIR OF LATERALLY SPACED GENERALLY PARALLEL DEPENDING LUGS, AND A PISTON EQUIPPED PLUNGER ROD PROJECTING UPWARDLY FROM THE UPPER END OF SAID CYLINDER, SAID PLUNGER ROD HAVING A MOUNTING ELEMENT AT ITS UPPER END, INCLUDING A PAIR OF LATERALLY SPACED, GENERALLY PARALLEL, UPWARDLY EXTENDING LUGS; (B) A BASE, INCLUDING A PLATE AND AN UPSTANDING WALL ELEMENT, SAID WALL ELEMENT BEING RECEIVED AT ITS UPPER PORTION IN SAID LOWER MOUNTING ELEMENT, A PAIR OF LATERALLY SPACED ADJUSTABLE STOP SCREWS MOUNTED IN THE UPPER PORTION OF SAID WALL ELEMENT ABUTTING SAID LOWER MOUNTING ELEMENT INTERMEDIATE SAID DEPENDING LUGS, AND (C) A HEAD, HAVING A DEPENDING FLANGE RECEIVED IN SAID UPPER MOUNTING ELEMENT OF SAID PLUNGER ROD, THE LOWER EDGE OF SAID FLANGE HAVING MOUNTED THEREIN A PAIR OF LATERALLY SPACED ADJUSTABLE STOP SCREWS ABUTTING SAID MOUNTING ELEMENT OF SAID PLUNGER ROD INTERMEDIATE SAID UPWARDLY EXTENDING LUGS. 